:1,10co20
"copy lines 1 through 10 after line 20"
:4,15t$
"copy lines 4 through 15 to end of document (t == co)"
:-t$
"copy previous line to end of document"
:m0
"move current line to line 0 (i.e. the top of document)"
:.,+3m$-1
"move current line +3 subsequent to the last line -1 (i.e. next to last)"